Meet Lesley Hatfield, Founder, NiteSweatz

The "runner's high," a rush of endorphins to the brain resulting in a peaceful or euphoric state, is a notion that's often debated. And the idea of achieving clarity during a workout is sometimes dismissed as new age-y. But perhaps these theories shouldn't be so easily brushed aside—Lesley Hatfield, an exercise physiologist and founder of NiteSweatz, can certainly confirm that epiphanies do happen while jogging, because her million-dollar idea was hatched while running with a client. Read more.